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ABSORBANCE AND PATH LENGTH

September 30, 2017Real Tech

According to Beer’s Law, absorbance is directly proportional to the path length of the UV light through the water sample. Absorbance is given by the following equation:

UVA = ε•b•c

where ε is the molar absorbtivity of the particular type of matter in the water sample, b is the path length of the water sample, and c is the concentration of matter in the water sample.

From the Beer’s Law equation above, it is clear that if the path length is altered by a certain factor the UVA measurement will be altered by the same factor. Therefore, a UVA reading measured at a 25 cm path length can easily be converted to the UVA at a 1cm path length simply by dividing the 25 cm UVA measurement by a factor of 25. Real Tech takes care of this for you however. All Real Tech instruments display the UVA in terms of a 1 cm path length except for the Real UV254 M4250 Analyzer which displays the UVA in terms of a 1 m path length. Both 1 cm and 1 m path lengths are industry standard for absorbance measurements.

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